Barbiturates are a class of central nervous system depressants used medically as sedatives and anticonvulsants. Barbiturates include Phenobarbital, pentobarbital, secobarbital, butalbital and amobarbital. Common physical effects include impaired motor coordination, anesthesia, sedation, cardiovascular and respiratory depression. Short acting barbiturates, such as secobarbital and butalbital, can be detected in urine up to 4 days after use. Long-acting barbiturates, such as Phenobarbital, can be detected in urine up to 3 weeks.